Abdominal exercise bench



FIG. 1 is a top perspective view of an abdominal exercise bench showing my new design;

FIG. 2 is another top perspective view thereof with the back in a raised position;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof, the side opposite being substantially a mirror image;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a rear elevational view thereof. 

The ornamental design for an abdominal exercise bench, as shown and described. 